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Spin-transport in an organic semiconductor without free charge carrier involvement

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arxiv 2101.02140 v1 pith:JPOIDUOF submitted 2021-01-06 cond-mat.mes-hall cond-mat.mtrl-sci

Spin-transport in an organic semiconductor without free charge carrier involvement

H. Popli , J. Wang , X. Liu , E. Lafalce , T. H. Tennahewa , H. Malissa , Z. V. Vardeny , C. Boehme This is my paper
classification cond-mat.mes-hall cond-mat.mtrl-sci
keywords alq3currentchargelayerspincarrierfreespin-transport
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have experimentally tested the hypothesis of free charge carrier mediated spin-transport in the small molecule organic semiconductor Alq3 at room temperature. A spin current was pumped into this material by pulsed ferromagnetic resonance of an adjacent NiFe layer, while a charge current resulting from this spin current via the inverse spin-Hall effect (ISHE) was detected in a Pt layer adjacent on the other side of the Alq3 layer, confirming a pure spin current through the Alq3 layer. Charge carrier spin states in Alq3, were then randomized by simultaneous application of electron paramagnetic resonance (EPR). No influence of the EPR excitation on the ISHE current was found, implying that spin-transport is not mediated by free charge-carriers in Alq3.

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